Question about Honeywell Programmable Thermostat Heater

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Wiring diagram I am looking for a wiring diagram for an eneroyal furace that has honeywell controls it has a 24v transformer and relay set up with this lettering configuration on it C R Y G W

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C--=common r-red=power y-yellow=cool g-green=fan w-white=heat..!

Posted on Sep 09, 2008

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Honeywell digital thermostat


Amy, First thing to do is verify the wiring is correct. Pop the thermostat off of its mounting plate, and check the wiring against the diagram in your ownners manual.Once you've verified that, check that your 24 volts is present. When you switch the fan switch to ON, does the fan run? If not, your 24v is likely not present, and neither heat nor cooling will cycle.

Jul 10, 2014 | Heating & Cooling

1 Answer

I am wiring a Honeywell wifi unit and I used a separate 24v transformer and connected to the c and rc terminal. My system is ac and heat and uses both and rc and rh wire. I wired the rc to the r ter


A thermostat is a switch. It connects 24vac from one terminal to another depending on the request. The 24vac comes from a transformer, usually located in the furnace and connects to the R terminal. Since you are using RH and RC without a jumper between it means there are two transformers, one in the furnace for heating (RH) and one in the air conditioner condenser used for cooling (RC).
Your old thermostat was probably mechanical and did not have a C (24vac common) terminal. Your new thermostat requires power to operate therefore needs a wire connected to a C terminal. I would get rid of the transformer you added and look for an unused wire in the bunch at the thermostat. If it's there connect it to C on the thermostat and to C on the furnace. Remove any jumper from R to RC or from RH to RC depending on your thermostat and connect wires same as the old thermostat.

Jul 04, 2014 | Heating & Cooling

1 Answer

I am installing honywell thermostat rth111/rth221 old thermostat has two wires that are yellow and need to know where to hook up


First things first. What type of system? Heat only, boiler or furnace? Central cooling.
Do NOT take wires off the old thermostat yet, or mark the color wire, to the terminal letter. Most times W,Y,G,R, terminals and maybe even a C terminal.

Your new thermostat should have the same letters. Sometimes they mix up color wire with terminal letters...... example (yellow wire to w terminal)
Also turn off power to equipment it is controlling. It is not high volts but you can short out the transformer. Hook uo wire color to same letter terminal on old stat, to new stat. Thats it.

Nov 12, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

Utica Boiler model # MGB100HD with a Honeywell Aquastat Relay model # Type L8148E will not operate the circular pump. THe damper works and I can hot wire the circulator pump but it won't turn on...


how did you hot wire it. did you jump the wires on the relay board or use another power source? Does the boiler burner start? Have 120 volts incoming to the relay board? You hear relay click when turning power on/off? If so bad relay, or loose wiring terminals on the board. This control has built in transformer that can burn out, that will stop the pump relay contacts from working.

Nov 07, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

HONEYWELL RTH5100B , THE WIRES I HAVE ARE BLUE, GREEN , WHITE , YELLOW, BROWN, THE A/C WILL NOT COME ON SHOULD I USE THE BLUE WIRE AND IN WHAT ? RC, R, Y, W, G, THANKS


Hi , you need to make sure rc and r are jumpered together.
R=red
G=green
W=white
Y=yellow

Blue is probably the other side of the transformer (24v) and usually would go on "c" if the thermostat has that particular post. To know for sure where blue goes, trace back to the furnace. Blue will be attached to a marked terminal either on a transformer or a circuit board. Hope this helps you.

Jun 24, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

Thermostat wiring


Thermostat wiring depends on which thermostat you are using. The blue wire is typically used for the 24v common. The red is your 24v power. If you have one transformer you will jump RC and RH.

Feb 16, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

I am changing from a Seco control thermostat model # tb1540e-g to


Rc/Rh should be from the transformer if a single transformer system. If its'a dual transformer system, then there should be a red wire to each from it's respective unit (furnace=Rh, condensor=Rc.).
W should be heat.
Y Should be cooling.
G should be fan.
I am not certain what E is, unless the stat can be used on a heat pump with backup electric heat, in which case it's for the electric heat.

The reason I say should be, is because if you are looking at wire colors, and not terminal designations, there is no guarantee the control wiring was connected following normal convention.

Reply back of any further questions.

Feb 03, 2009 | Honeywell Programmable Thermostat Heater

3 Answers

Honeywell RTH3100C


You need to go into the installer setting to change it from heatpump to single stage gas heat.Go to www.honeywell.com if youve lost them.

Dec 13, 2008 | Honeywell Programmable Thermostat Heater

2 Answers

Honeywell thermostat


If you have a forced air furnace with an air conditioner attached make sure you have a jumper wire between Rh and Rc. If the Bryant thermostat had a wire hooked up to C you do not want to hook this up to Rc. Just cap it off and put it back in the wall or disconnect that wire down in the furnace.

Aug 10, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Wiring a Honeywell Deluxe Programmable Thermonstat


did you mark which terminals you removed the wires from on the old stat? If not you will need to look on the furnace and see what letters they are connected to .. then connect to the same on the thermostat.

Feb 11, 2008 | Honeywell Programmable Thermostat Heater

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